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arXiv 0711.0216hep-phastro-ph
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GALLEX和GNO太阳中微子数据直方图双峰性分析

Analysis of bimodality in histograms formed from GALLEX and GNO solar neutrino data

P. A. Sturrock

摘要:

由GALLEX实验测量的太阳中微子捕获率的直方图显示似乎是双峰的,但随后的GNO实验却不是。为了评估这些结果的意义,我们引入了一个“双峰指数”的基础上的概率转换程序。这证实了GALLEX测量确实是双峰的(在99.98%的置信水平下),而GNO测量不是。跟踪双峰指数作为时间的函数显示,对双峰的最强贡献来自运行42至62,即从时间间隔1995.1至1996.9。前半部分(运行1至33)的双峰指数为2.56,而后半部分(运行33至65)的双峰指数为7.05。功率谱分析显示出类似的区别:从后半部分形成的功率谱中的峰强于从前半部分形成的功率谱中的峰,这表明双峰性和旋转调制是相关的。

英文摘要:

A histogram display of the solar neutrino capture-rate measurements made by the GALLEX experiment appears to be bimodal, but that of the follow-on GNO experiment does not. To assess the significance of these results, we introduce a "bimodality index" based on the probability-transform procedure. This confirms that the GALLEX measurements are indeed bimodal (at the 99.98 percent confidence level), and that the GNO measurements are not. Tracking the bimodality index as a function of time shows that the strongest contribution to bimodality comes from runs 42 to 62, i.e. from the time interval 1995.1 to 1996.9. The bimodality index for the first half (runs 1 through 33) is 2.56, whereas that for the second half (runs 33 through 65) is 7.05. Power-spectrum analysis shows a similar distinction: the peaks in the power spectrum formed from the second half are stronger than those in the power spectrum formed from the first half, suggesting that bimodality and rotational modulation are related.

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